Implement overscroll support for the virtual keyboard.

content/browser/renderer_host/render_widget_host_view_aura.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include "base/auto_reset.h"
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 857 matching lines @@
   else
     return bounds;
 }
 
 void RenderWidgetHostViewAura::SetBackground(const SkBitmap& background) {
   RenderWidgetHostViewBase::SetBackground(background);
   host_->SetBackground(background);
   window_->layer()->SetFillsBoundsOpaquely(background.isOpaque());
 }
 
+gfx::Size RenderWidgetHostViewAura::GetVisibleViewportSize() const {
+  gfx::Rect window_bounds = window_->bounds();
+  int viewport_width = std::max(
+      0, window_bounds.width() - insets_.left() - insets_.right());
+  int viewport_height = std::max(
+      0, window_bounds.height() - insets_.top() - insets_.bottom());
+  return gfx::Size(viewport_width, viewport_height);
+}
+
+void RenderWidgetHostViewAura::SetInsets(const gfx::Insets& insets) {
+  if (insets != insets_) {
+    insets_ = insets;
+    host_->WasResized();
+  }
+}
+
 void RenderWidgetHostViewAura::UpdateCursor(const WebCursor& cursor) {
   current_cursor_ = cursor;
   const gfx::Display display = gfx::Screen::GetScreenFor(window_)->
       GetDisplayNearestWindow(window_);
   current_cursor_.SetDisplayInfo(display);
   UpdateCursorIfOverSelf();
 }
 
 void RenderWidgetHostViewAura::SetIsLoading(bool is_loading) {
   is_loading_ = is_loading;
@@ skipping 2285 matching lines @@
     RenderWidgetHost* widget) {
   return new RenderWidgetHostViewAura(widget);
 }
 
 // static
 void RenderWidgetHostViewPort::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content